The key fragment for integrating isotope and unveil gracefully.

app.snippet.js

// Never relayout the grid more than twice a second
var relayout = _.throttle(function() {
    $books_grid.isotope('reLayout');
}, 500);


/*
 * Begin unveiling visible books in the grid.
 */
var unveil_grid = function() {
    $books_grid.find('img').unveil(800, function() {
        $(this).load(function() {
            relayout();
        });
    });
};